8-Bit
Microcontroller
with 8 Kbytes
Flash
AT89C52
Features
•
Compatible with MCS-51
TM
Products
•
8 Kbytes of In-System Reprogrammable Flash Memory
Endurance: 1,000 Write/Erase Cycles
•
Fully Static Operation: 0 Hz to 24 MHz
•
Three-Level Program Memory Lock
•
256 x 8-Bit Internal RAM
•
32 Programmable I/O Lines
•
Three 16-Bit Timer/Counters
•
Eight Interrupt Sources
•
Programmable Serial Channel
•
Low Power Idle and Power Down Modes
( T 2 )
P 1 . 0
V
C C
( T 2
E X )
P 1 . 1
P 0 . 0
( A D 0 )
P 1 . 2
( I N T 0 )
P 3 . 2
A L E / P R O G
( R D )
P 3 . 7
P 2 . 3
( A 1 1 )
( T X D )
P 3 . 1
E A / V P P
( W R )
P 3 . 6
P 2 . 4
( A 1 2 )
( R X D )
P 3 . 0
P 0 . 7
( A D 7 )
( T 1 )
P 3 . 5
P 2 . 6
( A 1 4 )
R S T
P 0 . 6
( A D 6 )
P 0 . 5
( A D 5 )
P 0 . 4
( A D 4 )
P 0 . 3
( A D 3 )
P 0 . 2
( A D 2 )
P 1 . 3
P 0 . 1
( A D 1 )
( I N T 1 )
P 3 . 3
P S E N
X TA L 2
P 2 . 2
( A 1 0 )
( T 0 )
P 3 . 4
P 2 . 7
( A 1 5 )
X TA L 1
P 2 . 1
( A 9 )
G N D
P 2 . 0
( A 8 )
P 2 . 5
( A 1 3 )
2 0
1 9
1 8
1 7
1 6
1 5
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
2 1
2 2
2 3
2 4
2 5
2 6
4 0
3 9
3 8
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
( S S )
P 1 . 4
( M O S I )
P 1 . 5
( M I S O )
P 1 . 6
( S C K )
P 1 . 7
Pin Configurations
PDIP/Cerdip
Description
The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8
Kbytes of Flash programmable and erasable read only memory (PEROM). The de-
vice is manufactured using Atmel’s high density nonvolatile memory technology and
is compatible with the industry standard 80C51 and 80C52 instruction set and pinout.
The on-chip Flash allows the program memory to be reprogrammed in-system or by
a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU
with Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputer
which provides a highly flexible and cost effective solution to many embedded control
applications.
(continued)
2 3
1
I N D E X
C O R N E R
3 4
P1.0
(
T
2)
VCC
P1.1
(
T
2
EX)
P1.2
P1.3
NC
4 2
4 3
4 0
4 1
6
5
4
4 4
3
2
2 6
2 5
2 8
2 7
2 4
1 8
1 9
2 0
2 1
2 2
N C
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
2 9
3 0
3 9
3 8
3 7
3 6
3 5
3 3
3 2
3 1
N C
P S E N
XT
AL1
GND
XT
AL2
GND
P0.0
(AD0)
A L E / P R O G
(RD)
P3.7
E A / V P P
(WR)
P3.6
( R X D )
P 3 . 0
P 0 . 7
( A D 7 )
P 2 . 6
( A 1 4 )
P 0 . 6
( A D 6 )
P 0 . 5
( A D 5 )
P 0 . 4
( A D 4 )
P0.3
(AD3)
P0.2
(AD2)
P0.1
(AD1)
( I N T 0 )
P 3 . 2
( T X D )
P 3 . 1
( T 1 )
P 3 . 5
( I N T 1 )
P 3 . 3
( T 0 )
P 3 . 4
P 2 . 7
( A 1 5 )
(A11)
P2.3
(A12)
P2.4
(A10)
P2.2
(A
9)
P
2
.1
(A
8)
P
2
.0
R S T
P 2 . 5
( A 1 3 )
P1.4
(
SS)
( M O S I )
P 1 . 5
( M I S O )
P 1 . 6
( S C K )
P 1 . 7
PQFP/TQFP
P1.0
(
T
2)
VCC
P1.1
(
T
2
EX)
P0.0
(AD0)
P1.2
A L E / P R O G
(RD)
P3.7
XT
AL1
E A / V P P
(WR)
P3.6
GND
( R X D )
P 3 . 0
P 0 . 7
( A D 7 )
P 2 . 6
( A 1 4 )
P 0 . 6
( A D 6 )
P 0 . 5
( A D 5 )
P 0 . 4
( A D 4 )
P0.3
(AD3)
P0.2
(AD2)
P1.3
P0.1
(AD1)
P S E N
XT
AL2
( I N T 0 )
P 3 . 2
( T X D )
P 3 . 1
( T 1 )
P 3 . 5
( I N T 1 )
P 3 . 3
( T 0 )
P 3 . 4
P 2 . 7
( A 1 5 )
(A11)
P2.3
(A12)
P2.4
(A10)
P2.2
(A
9)
P
2
.1
(A
8)
P
2
.0
NC
2 3
1
R S T
I N D E X
C O R N E R
N C
NC
P 2 . 5
( A 1 3 )
3 4
N C
4 2
4 3
4 0
4 1
6
5
4
4 4
3
2
2 6
2 5
2 8
2 7
1 8
1 9
2 0
2 4
2 1
2 2
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
2 9
3 0
3 9
3 8
3 7
3 6
3 5
3 3
3 2
3 1
P1.4
(
SS)
( M O S I )
P 1 . 5
( M I S O )
P 1 . 6
( S C K )
P 1 . 7
PLCC/LCC
0313E
